Rank models with compensatory multidimensional IRT (MIRT) via marginal-MLE
EM. Each model has a D-dimensional ability vector and each item a slope
vector a and intercept d, with P = c + (1-c)·σ(aᵀθ + d) (c = 0 for
2PL). Abilities are scored by the rotation-invariant reference composite
āᵀθ (projection onto the mean slope direction). Port of scorio.rank.mirt.
Rank models with compensatory multidimensional IRT (MIRT) via marginal-MLE EM. Each model has a
D-dimensional ability vector and each item a slope vectoraand interceptd, withP = c + (1-c)·σ(aᵀθ + d)(c = 0for 2PL). Abilities are scored by the rotation-invariant reference compositeāᵀθ(projection onto the mean slope direction). Port ofscorio.rank.mirt.